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Re-use Harmonic Balancer? (305 to 350)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Eric, Dec 26, 2000.

  1. Eric

    Eric Registered Member

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    Do I need to buy a new harmonic balancer when changing from my stock 305 to a crate 350 and if so, what size do I get?

    Can I re-use my flexplate?



    One eyed super fly- watch out!
    86 K5 Blazer
     
  2. bart

    bart Registered Member

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    No, you need to get a balancer for a 350. The one from your 305 is much smaller.

    bart
     
  3. Eric

    Eric Registered Member

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    Found a flexplate at Summit Racing with 168 teeth and marked for pre-1986 vehicals with 2 piece rear main seal. Is this the correct one for my 350 crate motor (71-85), just want to make sure?

    How about that harmonic balancer, anyone else have some suggestions.

    Thanks alot!!

    One eyed super fly- watch out!
    86 K5 Blazer
     
  4. Jason73K5

    Jason73K5 1/2 ton status

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    I'd go with the new balancer too. Sounds like the right flexplate.
     
  5. Cavalry

    Cavalry 1/2 ton status

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    Location:
    upstate NY(although I cant figure out why)
    When I swapped over I got a boneyard (looked good) bal off a 70's vintage GM 350. The 305 ones that come with the K5's suck 'cause of the timing pickup on the top of the timing chain cover. A standard timing marker wont line up with this kind of balancer. I got a flexplate for a 87 chevy PU (for 1 pc rear main) at autozone. Just check your toothcount and look for the different hub size and weights, about $45.

    <P ID="edit"><FONT SIZE=-1>Edited by Cavalry on 12/27/00 08:41 PM (server time).</FONT></P>
     

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